I put a post on this last year when I was starting to cut out a pattern for my DG's quilt. They were all 9 3/4". I called Missouri Star and they couldn't believe it, then measured and said I was right. I then called the company that made them in New York and they couldn't believe it either. Some one needs to get this right, if you buy a layer cake, it should be 10" square and not 9 3/4".